I was using an older code which had ave/spatial fix style: fix 4a all ave/spatial 1 1000000 1000000 x lower 10.0 v_atemp file 10Temperature.txt units box fix 4b all ave/spatial 1 1000000 1000000 x lower 20.0 v_atemp file 20Temperature.txt units box fix 5a all ave/spatial 1 2000000 2000000 x lower 10.0 v_atemp file 10Temperature2.txt units box …